21. Nuclear Chemistry
Rate of Radioactive Decay
Multiple Choice
Multiple ChoiceHow long will it take for 80% of a 1.20-mg sample of Rn-220 to decay? The half-life of Rn-220 is 55.6 s.
A
17.9 s
B
55.6 s
C
111 s
D
129 s
E
222 s
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